chore(deps): update testcontainers to v1.21.3

Author: SIMULATAN-Bot

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ opentelemetry-semconv-incubating = "1.30.0-alpha"
 opentelemetry-instrumentation = "2.11.0-alpha"
 micrometer = "1.14.2"
 junit = "5.12.2"
-testcontainers = "1.20.6"
+testcontainers = "1.21.3"
 ktor = "3.1.3"
 
 jobrunr = "8.0.0"